Replace RadioButton with Button, similar to new brush.xml in Res/layout:
<?xml version= "1.0″encoding=" utf-8″?>
<linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"
android:orientation= "Vertical"
android:background= "@drawable/white"
Android:layout_width= "Fill_parent"
android:layout_height= "Fill_parent" >
<com.pstreets.graphics2d.guidebeegraphics2dview
Android:id= "@+id/graphics2dview"
Android:layout_weight= "1″
Android:layout_width= "Fill_parent"
android:layout_height= "Wrap_content"/>
<linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"
Android:layout_width= "Wrap_content" android:layout_height= "Wrap_content"
android:orientation= "Horizontal" >
<button android:text= "pattern"
Android:id= "@+id/btnpattern"
Android:layout_width= "Wrap_content"
Android:textcolor= "@color/black"
Android:checked= "true"
android:layout_height= "Wrap_content" >
</Button>
<button android:text= "Gradients"
Android:id= "@+id/btngradients"
Android:layout_width= "Wrap_content"
Android:textcolor= "@color/black"
android:layout_height= "Wrap_content" >
</Button>
</LinearLayout>
</LinearLayout>